Originally Posted by
AA_EXP09
In some places, there isn't really much of a choice when flying *A (i.e. SFO has no PP lounges, and I will not go to T5 from T1 to use the AF/Swissport lounge in ORD), and I would rather enter the UA lounge in LHR than the PP lounge (admittedly, I would rather enter the LH lounge over the UA lounge, and >90% of my flying out of LHR is from T3/T5.)
At LHR T3, the PP also allows one access to the No. 1 Heathrow as well as the Swissport lounges. Not sure about T5.
At SFO, if one has a Amex Plat or Centurion, one may use the Amex lounge at T3.